'byte index' redeclared as different kind of symbol error

Using Arduino Programming Questions
1

Hi guys.
Yesterday, I complied this program and it run well. Now, I'm rebuilting it and some errors occurt.
Can you tell me how to fix that?
I cannot understand why same code but not same result.
Many thanks.

char inData[24];
byte index;
boolean started = false;
boolean ended = false;

void setup()
{
Serial.begin(9600);
Serial.println("Temperature & Humidity");
}

void loop()
{
  while(Serial.available() > 0)
  {
	char aChar = Serial.read();
	if(aChar == '<')
	{
	    started = true;
	    index = 0;
	    inData[index] = '\0';
	}
	else if(aChar == '>')
	{
	    ended = true;
	}
	else if(started)
	{
	    inData[index] = aChar;
	    index++;
	    inData[index] = ',';
	}
  }

  if(started && ended)
  {
	// Use the value
	if(inData[0] == 'T')
	{
	   inData[0] = ' ';
	   int windVal = atoi(inData);
           Serial.println(" ");
	   Serial.print("Temp:");
           Serial.print(inData);
           Serial.print("C");
           Serial.println(" ");
	}
	else if(inData[0] == 'H')
     {
	   inData[0] = ' ';
           int temp = atoi(inData);
	   Serial.println(" ");
           Serial.print("Humidity:");
           Serial.print(inData);
           Serial.print("%");
           Serial.println(" ");
     }

	started = false;
	ended = false;

	index = 0;
	inData[index] = '\0';
  }
}
2

I compiled your code, and got the following error message

Sketch uses 1726 bytes (5%) of program storage space. Maximum is 32256 bytes.
Global variables use 257 bytes (12%) of dynamic memory, leaving 1791 bytes for local variables. Maximum is 2048 bytes.